I don't know about booking up 180 days in advance, but I've always made ADRs for CM, 1900 Park Fare, CP, & LTT (all for dinners) about 3 months ahead & been able to get the times I want (6:00 or 7:00 p.m.). I've seen on these forums though, that by 1 month out it is often impossible to get any good seating times.
**We always go in the "off season" though & pull the kids out of school.
Dreams Unlimited Travel is committed to providing you with the very best vacation planning experience possible. Our Vacation Planners are experts and will share their honest advice to help you have a magical vacation.